Professional liability solutions for accountants

Accountants errors and omissions insurance from The Hanover and McGowanPRO 

CPAs and accounting professionals operate with the highest demands on their performance and accuracy—an expectation to get every detail right, every time. Unfortunately, despite attention to detail and careful calculations, allegations of negligence, errors and omissions in the performance of professional accounting services happen and can lead to claims or lawsuits.

The Hanover partners with McGowanPRO to offer you and your clients CPAOneProSM — an accountants professional liability program designed to meet the needs of accounting firms of all sizes. Written through a risk purchasing group by McGowanPRO, the program offers robust coverage along with experienced risk management and expert claims services.

CPAOneProSM targets a wide range of accounting professionals and firms of all sizes, including:

  • Accountants
  • CPA firms
  • Bookkeepers
  • Tax preparers
  • Enrolled agents

The CPAOneProSM policy was designed by professional liability insurance experts with decades of experience working with CPA firm clients. In addition to higher supplemental coverage available through the exclusive ONEPRO endorsements, clients benefit from an RPG credit.

Special features and coverages include:

  • Limits up to $10MM
  • Claims expenses in addition to the limits of liability available
  • Loss only/first dollar defense deductibles available
  • Aggregate deductible options available
  • Worldwide coverage
  • Broad network security and privacy coverage

Beyond coverage, the robust risk management and claims services include:

  • Loss control hotline
  • Pre-claim assistance
  • Claims triage services
  • Guidance on best practices
  • Sample engagement letters and provisions
  • Engagement letter and website review
  • NASBA approved webinars
  • Industry updates
  • CPA alerts
  • Tax organizer, quality control document and marketing material review





    CPAOneProSM targets a wide range of accounting professionals and firms of all sizes, including:

    • Accountants
    • CPA firms
    • Bookkeepers
    • Tax preparers
    • Enrolled agents

    Product resources

    Learn more about CPAOneProSM

    Visit to learn more about the CPAOneProSM offering.

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    Resources for you

    CPAOnePro Application

    CPAOnePro Application - New York Only

    CPAOnePro Warranty Application

    Email the completed application to McGowanPRO.

    Resources for your customers

    McGowanPRO offers a wide range of risk management resources to help your customers manage risk.

    Engagement letters



    See more McGowanPRO resources for accountants

    Customer tools

    McGowanPRO customer support


    Contact McGowanPRO

    CPAOneProSM is available exclusively through McGowanPRO. To learn more or submit business, contact:

    Gary Sutherland
    Managing Director, MPA, CIC, MLIS


    About The Hanover

    The Hanover is the marketing name for the property-casualty and general insurance operations of The Hanover Insurance Group, Inc. All products are underwritten by The Hanover Insurance Company, Citizens Insurance Company of America or one of their insurance company subsidiaries or affiliates. Coverage may not be available in all jurisdictions and is subject to the company underwriting guidelines and the issued policy. This material is provided for informational purposes only. For more information about The Hanover visit our website at

    About McGowan Program Administrators

    McGowan Program Administrators (MPA) is America’s leading writer of innovative insurance programs. MPA is a Managing General Underwriter and Program Manager. MPA designs, administers and markets highly-specialized programs of insurance. These programs are available exclusively through MPA.